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Peter's user avatar
Peter
  • Member for 4 years, 10 months
  • Last seen more than 1 year ago
  • United Kingdom
21 votes
6 answers
9k views

Does this smartphone photo show Mars just below the Sun?

17 votes
2 answers
3k views

How do planetarium apps and software calculate positions?

10 votes
2 answers
2k views

JPL Horizons - "highly accurate measurements of planetary positions" - how do they do it?

9 votes
1 answer
603 views

What unit of year in JPL Small-Body Database Lookup?

8 votes
2 answers
570 views

Trying to understand lunar phases

6 votes
1 answer
591 views

J2000 and J2000.0 difference?

5 votes
1 answer
2k views

Straightforward derivation of the sunrise equation

5 votes
1 answer
476 views

Orbital modelling, three bodies, leapfrog numerical integration

5 votes
1 answer
290 views

Question about Cowell's method

5 votes
1 answer
486 views

Sidereal times occuring twice a day question

4 votes
0 answers
248 views

Trying to find the source of these three orbital elements

3 votes
1 answer
381 views

Moon's equation of the centre discrepancy

3 votes
1 answer
105 views

Time of comet at perihelion query

2 votes
1 answer
142 views

Orbital modelling - best choice for initial JPL Horizons data?

2 votes
0 answers
119 views

Tropical or sidereal orbital period when calculation Solar System positions?

2 votes
0 answers
92 views

Are there two mean Suns?

1 vote
1 answer
440 views

Understanding the constant 6.697374558 when finding GMST

1 vote
1 answer
125 views

Meaning of $\cos H$ in the rising and setting formula